Gedbozst thommeln



(Model.)

G. THOMMEN.

WATCH.

No. 289,728. i Patented Dee. 4, 1888.

UNITED STATES Parietti WATCH.

SPECIFICATION forming part of Letters Patent No. 289,728, dated December4, 1883.

Application filed May 3l, 1883. (Model.) Patented in Germany February15` 1579, Xo. 6,878; in France February 2l, 1ST?,

' No. 129,282, and in Belgium March 15, 1879, No. 47,522.

To all whom it izm/ concern.-

Be it known that 1, GEDEON TI-roirnnn, a citizen of Switzerland, and aresident ot`.\Valdenburg, near Basel, Switzerland, have iuvented certainImprovements in XVatches, (for which I have obtained German LettersPatent No. 6,878, February 15, 1879; French Letters Patent No. 129,282,February 2i, 1879, and Belgian Letters Patent No. 47,522, March 15, 1879,) of which the following is a specification.

My invention relates to certain improvements in the construction ofwatches, with more special reference to the manner of securing thecannon-pinion on the axis of the pinion ot' the center-wheel, and to thedevices for throwing the hand setting and winding mechanism into and outof gear, as more fully described hereinafter.

In the accompanying drawings, Figure 1 is a view, drawn to an enlargedscale, of sutiicient of a watch to illustrate my invention. Fig. 2 is asimilar view, showing the rocking lever carrying the gears and separatefrom its operating devices. Fig. 8 is a view showing the locking-lever.Fig. i represents in different views the cannon-pinion and the devicesfor mounting it on the axis ot' the center-wheel. Figs. 5, 6, and 7 areviews illustrating the construction Ot' the spring-pawl for theratchetwheel of the mainspring.

The operative parts ofthe watch are mounted, as usual, on the front andback plates, m and m', 7L being the rocking lever, carrying at oppositeends gear-wheels j' and g, gearing into the same intermediate wheel, h',to which motion is imparted by the usual winding-stem, s, either to windup the spring or to set the hands, according to the position to whichthe lever 7L has been adjusted. A spring, p, acts on one end of thislever, to keep it normally in the position shown in iull lines, Fig. 1,with the pinion g in gear with the ratchet-wheel i on the barrel of themainspring, so that the turning of the winding-stem will wind up thespring. When the lever h is moved to the position indicated by dottedlines in Fig. 1, the wheel g will be thrown out oi" gear with the wheelz, while the pinion f, at the opposite end ofthe lever, will be throwninto gear with the wheel k, for transmitting motion to the minute andhour hand pinions to set the hands.

On referring to Fig. 4, illustrating the method of mounting thecannon-pinion c, it will be seen that this pinion is provided with aninternal undercut or dovetailed annular recess, fr, into which isinserted a spiral spring, c, the latter retaining its position by itselasticity. On the pole d of the center-wheel c is eut au annularrecess, into which the inner face of the spring c slips, to retain thecannon-pinion ar when the latter has been placed in position on thetapered pole (l.

The rocking lever 7i, Fig. 1, is moved into the hand-setting position bymeans ot' the bent lever n, which is pivoted to the plate m at a', andhas its outer end projecting outside the case, so that it may be pulledoutward to the position indicated by dotted lines in Fig. 1. This levera is provided with a nose, if, acting on an inclined or cam face on theedge of the lever h, so that when the said lever n is pulled outward, asshown by dotted lines, that end ol" the rocking lever 7L will be presseddownward against the action of the spring p, to throw the pinion j' intogear with the wheel 1.'. llo maintain the lever n in itsinneror normalposition, a spring, o, acts on a nose, n, on the lever, the said nosebearing such a relation to the pivoting center of the lever that whenthe latter is pulled outward to the position shown in Fig. 3 thepressure of the spring will be toward the pivot, or on what may betermed a dead-eenter,77 so that there will be then no tendency to returnthe lever to its normal position 5 but as soon as the lever n is pressedinward a little, the spring o will begin to act. One end ofthe rockinglever h is iorked, and between these forks is a pin, I, secured to theplate m in such a position that it will limit the extent of motion ofthesaid lever to insure the gearing of the pinions j' and with theircorresponding wheels, only to the proper extent The spring-pawl q i'orthe barrel ot" the mainspring is constructed as shown in Figs. 5, (i,and 7. It is provided with apivot-pin, q, passing through the plate lm,and also has secured to it one end ot' a steel spring-wire, q', whichpasses freely through an opening or slot in the front plate, and has itsopposite end secured to the back plate, being thus at right angles tothe plane of movement of the pawl. Vhen the end ot' the pawl liesbetween the IOC) Q germes having a Cani-edge, and the spring 0, with thelever u, acting on the said rocking lever, and having a nose, n, to beacted von by the said spring in the relation substantially as described,whereby the nose will be on a deadeenter when the lever n is in its openposition. In testimony whereof I have signed my naine to thisspecification in the presence of two subscribing witnesses.

GEDEON THOMMEN. Vitnesses:

HENRY ForACKRR, HARRY L. AsHRNRRL'rRR.

